Clutch mechanism for electromagnetic sound recording and reproducing devices



Feb, 15, 1%33. s, g U ZJ$A2 CLUTCH MECHANISM FOR ELECTROMAGNETIC SOUND RECORDING AND REPRODUCING DEVICES Filed June 6, 1935 Jam/Begun Patented Feb. 15, 1938 CLUTCH MECHANISM FOR ELECTROMAG- NETIC SOUND RECORDING AND REPRO- DUCING DEVICES Semi Begun, Berlin, Germany, assignor to C.

Lorenz 'Aktiengesellschaft, Berlin-Tcmpeihof,

Germany, a company Application June 6, 1935, Serial No. 25,352 In Germany June 9, 1934 1 vClaim.

The invention relates to electromagnetic sound recording and reproducing devices of the kind having a steel tape or wire as a sound record carrier such as is customary especially with the so-called -Poulsen method. This tape or wire is in a well-known manner arranged on two spools or drums in orderalternately to be wound onto one spool andthen from this onto the other spool. In each case one of these spools is pulling at the tape or wire. As soon as the movement of the tape or.wire is to be reversed for well-known reasons, the spool that has been pulling at the tape or wire is disconnected from the drive, and the other spool in its turn attached thereto in order now to pull at the tape or wire.

The invention has for its object to provide coupling means by which'the parts moved in this way by means of either one or the other of the spools shall be completely and automatically disconnected from the motor shaft. In addition, the connecting and disconnecting shall be efiected within the shortest possible time and with the least expenditure in means. In 'order to perform this a clutch is employed whose action solely depends upon the direction in which one of the two clutch members is rotated. One embodiment of the invention is described hereinafter by way of example, reference being had to the accompanying drawing in which Fig. 1 is a partially sectioned elevation of one of the spools, its clutch and part of the drive, and Fig. 2 shows a section on the line 2-2 of Fig. 1.

The clutch is comprised of two members I, 2 Member I is constructed as a belt pulley, adapted to be'driven by a belt 3 by whichit is in connection with a motor not shown. Member 2 carries a spool 4 which is one of the two spools that in a well-kno-wn manner are provided with a steel wire-5 adapted to be wound from one'spool onto the other alternately. Instead of the wire 5 a tape or the like may be disposed to serve as a sound record carrier. Two studs 1, secured to memberi, are each fitted with a jaw 6 rotatably' mounted on these studs. The jaws 6 are thus disposed eccentrically withrespect to parts I,-2. As will be seen-from- Fig. 2, the jaws 6 each have a curved edge facing the inner cylindrical surface of the member 2. Each jaw has a slot I3. Rotatably mounted on a trunnion III of the member l is a disc 8 provided with two pins 9. These each project into one of the slots l3. 'The disc 8 has two arcuate slots I i through which thestuds i extend. The slots H are concentric'with respect to trunnion H]. A brake block i2 contacts with the circumference of the disc 8.

The mode of action is as follows.

When clutch member I is rotated in the direction of the arrow. shown in full lines in Fig. 2, the studs I slide within the slots H as indicated by a full-line arrow. The jaws 6 are thus moved on the pins 9 in a direction likewise denoted by a full-line arrow, so that their curved edges are withdrawn from the clutch member 2. Disc 8 is. by the brake block l2 prevented from rotating on trunnion iii until the studs 1 come against the respective ends of the slots II, when the friction between the parts 8 and I2 is overcome so that the parts i, 'l,. 6, 9, 8 will now rotate 'conjointly, the part 2, d however not sharing in this movement since the jaws 6 have been so moved on the pins 9 that they do not contact with clutch member 2. I

It will thus be seen that by reversing the movement of the belt 3 the movements of the parts I, l, 6, 9, 8 will be those indicated by the dotted-line arrows, so that the curved edges of the jaws 5 are brought to contact with the clutch member 2 and thus cause the part 2, t to be driven by meansof member l.

The jaws 6 preferably consist of hard paper provided with an insertion of cloth, in order that they shall be emcient and noiseless in their action. 1 I

It will be evident that the usual second spool allotted to spool l in order tocarry the wire 5 is likewise fitted with a clutch constructed as herein described.

What is claimed is:

In a clutch mechanism for a magnetic sound recordingand reproducing machine, a first clutch member coupled to a spool forcarrying tape or wire, an intermediate disc continuously maintained under influence of a braking means, a second clutch member connected to a driving shaft, a plurality of jaws ful'crumed on said sec and clutch member and arranged to cooperate with said first clutch member. means-on said disc for controlling the cooperation of said jaw members with said first clutch member, .said disc being provided with slots cooperating with means on said second clutch member for limiting the relative movement between said disc and second 50 .member.

SEMI BEGUN. 

